Question

k) 8+(_9+)=(_+9)+3

l) _+(2+1)=(5+_)+_

m) A+(b+c)=(_+_)+c

n) (5+3)+7=5+(_+_)

Answer 1

k) 8 + (3 + 9) = (8 + 9) + 3

l) 5 + (2 + 1) = (5 + 2) + 1

m) a + (b + c) = (a + b) + c

n) (5 + 3) + 7 = 5 + (3 + 7)

Espero ajudar.